US1993736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters and process for producing them
Assignee: EIDP Inc
•
Filing: 1931-06-10
•
Granted: 1935-03-12
•
Expires: 1951-06-10
Abstract
No abstract record available.
Inventors
- 👤 Graves George De Witt
- 👤 Lawson Walter Eastby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/34; C08; C08K; C08K5/00; C08K5/04; C08K5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-03-11 | 1938-09-10 | 1939-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-11 | 1942-09-10 | 1943-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-11 | 1946-09-10 | 1947-03-12 | $7700.00 | Window Closed / Lapsed |